Different techniques and technology used to crush ore in early gold mining. ... The earliest gold mining was done by hand, using a hammer and a pick or a gold pan. ... 1936, examine a flat stone that served as the base of a small arrastre mill.

A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. ... Other metallurgical developments such as silver and gold mining mirrored ... belt-powered trip-hammer crushing stages and giant metal grading/sorting ... Typically, crushing stages are followed by milling stages if the materials...